Greetings,
I'm not sure that if you have found a resolution to your issue, but we tried something similar and got it working. Please find below the settings that we tried:
LPD_CUST -> Role : RPM_RIH, Instance OIF
Link Details
Link Text INM_UI_NAV/PS_PROJECT
Description INM_UI_NAV/PS_PROJECT
Application Type : URL
Application Parameter: URL dummy
Application Alias PS_PD
Lastly : do check the settings for Web Server Alias in SPRO .One of our functional consultants http://scn.sap.com/people/shashankb got it working. You can refer to the message from SAP 150975 / 2016 .
Hope this helps!!
Message was edited by: Pablo Ghosh Roy